magnum airgap intake ?

I converted from la style heads to magnum heads and the thermostat housing is smaller on the magnum airgap intake. Anybody know what part I need for the conversion. I will call edelbrock in the morning but thought I would ask here first. Both intakes are edelbrocks. The old one is the performer rpm for la engines and takes a normal mopar smallblock housing. The old housing and thermostat does not fit.